FINE STRUCTURE, HYPERFINE STRUCTURE, AND STARK EFFECT IN THE NO $A^{2}\Sigma^{+}$ STATE BY OPTICAL RADIO FREQUENCY DOUBLE RESONANCE
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Date
1974
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Ohio State University
Abstract
Using the SeI 1961 {\AA} spectral line to pump the $J = 3/2$ component of the $v = 3$, $N = 1$ level of the NO $A^{2}\Sigma^{+}$ state, we observe the rho-doubling hyperfine transitions and Stark effect by optical radio-frequency double resonance. The following molecular constants are obtained: the rho-doubling constant $\gamma = - 82.91 \pm 0.03$ MHz; the hyperfine parameters of the $^{14}N$ nucleus b = 40.29 $\pm 0.07$ MHz, $c = 2.25 \pm 0.11$ MHz, and eq $Q = - 2.88 \pm 0.17$ MHz; and the dipole moment $\mu = 1.10 \pm 0.03$ D, where all errors represent three standard deviations. The value of $\gamma$ is explained reasonably well by calculations of the A-X spin-orbit mixing, while b and c are within 6\% and 18\% of recent CI calculations by S. Green. However, the measured dipole moment differs considerably from the CI value, $\mu= 0.40 \pm 0.10$ D. This discrepancy is not explained by non-adiabatic and relativistic effects omitted from the CI calculation.
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Author Institution: Department of Physics, Fordham University; Department of Chemistry, Columbia University